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                <span class="article-type type-1 float-left">原创</span>                <h1 class="title-article">Mac下安装配置Python2和Python3并相互切换使用</h1>
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                                            <span class="c-gray">置顶</span>
                                                                                                                                                                <span class="time">2018-07-12 22:04:51</span>
                    <a class="follow-nickName" href="https://me.csdn.net/u014259820" target="_blank" rel="noopener">三天打鱼，两天晒网</a>
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                                            <h1><a id="Python2_0"></a>安装Python2</h1>
<p>Mac系统已经默认带有Python2.7了，所以无需安装它。<br>
控制台输入：<code>which python</code> 可以查看到如图：<br>
<img src="https://img-blog.csdn.net/2018071222022496?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQyNTk4MjA=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述"></p>
<h1><a id="Python3_5"></a>安装Python3</h1>
<p>Mac系统已经默认带有Python2.7了，所以无需安装它。<br>
安装Python3的话，控制台输入：<code>brew install python3</code> 然后按回车。安装好后，输入<code>which python3</code> 可以看到如图：<br>
<img src="https://img-blog.csdn.net/20180712220341329?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQyNTk4MjA=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述"></p>
<h1><a id="Python_10"></a>不同版本Python路径</h1>
<p>Mac系统自带Python2.7，而我们安装Python3的时候，可以通过brew命令安装或者官网的pkg安装。安装后，它们的文件保存路径如下：</p>

<table>
<thead>
<tr>
<th align="left">来源</th>
<th align="right">python安装路径</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">系统默认(2.7)</td>
<td align="right"><code>/System/Library/Frameworks/Python.framework/Versions/2.7</code></td>
</tr>
<tr>
<td align="left">brew安装(2.7/3.x)</td>
<td align="right"><code>/usr/local/Cellar/python</code></td>
</tr>
<tr>
<td align="left">官网pkg安装(3.x)</td>
<td align="right"><code>/Library/Frameworks/Python.framework/Versions/3.x</code></td>
</tr>
</tbody>
</table><h1><a id="Python2Python3_18"></a>配置Python2和Python3</h1>
<p>1.控制台输入：<code>vi ~/.bash_profile</code><br>
按一下键盘<code>I</code>键，变成可编辑状态后，在末尾加上如下内容：</p>
<pre><code># Setting PATH for Python 2.7
PATH="/System/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}"
export PATH
# Setting PATH for Python 3.6.5
PATH="/usr/local/Cellar/python/3.6.5/bin:${PATH}"
</code></pre>
<p>编辑完后，按一下键盘<code>esc</code>键，退出编辑状态，然后输入：<code>：wq</code>按回车，这样就保存了所修干的~/.bash_profile文件</p>
<p>2.控制台输入：<code>vi ~/.bashrc</code><br>
按一下键盘<code>I</code>键，变成可编辑状态后，输入如下内容：</p>
<pre><code>alias python2='/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7'
alias python3='/usr/local/Cellar/python/3.6.5/bin/python3.6'
# alias python=python3
</code></pre>
<p>同理，编辑完后，按一下键盘<code>esc</code>键，退出编辑状态，然后输入：<code>：wq</code>按回车，这样就保存了所修干的~/.bashrc文件</p>
<p>3.上述步骤的修改，虽然保存了，但是系统还没让其生效，所以我们需要source一下。控制台输入：<code>source ~/.bash_profile</code> 然后按回车键和<code>source ~/.bashrc</code> 然后按回车键。最后关闭终端，重新打开，即生效。</p>
<p>4.输入对应的命令，可自由选择使用对应的Python版本。<br>
终端输入：<code>python</code> 或者 <code>python2</code>，如图：<br>
<img src="https://img-blog.csdn.net/20180712215510608?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQyNTk4MjA=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述"><br>
输入：<code>python3</code>，如图：<br>
<img src="https://img-blog.csdn.net/20180712215534319?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQyNTk4MjA=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述"><br>
如果要退出Python控制台的话，可以输入命令<code>exit()</code> 然后回车即可，或者直接按键盘 <code>Ctrl-D</code> 也可以直接退出Python控制台。<br>
<img src="https://img-blog.csdn.net/20180712220724341?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQyNTk4MjA=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述"><br>
<img src="https://img-blog.csdn.net/20180712220858637?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQyNTk4MjA=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="这里写图片描述"></p>

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来源 |  公众号：小鹿动画学编程

写在前边
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                <a class="title text-truncate" target="_blank" href="https://blog.csdn.net/u014259820/article/details/100580970#comments">Mac下关于pip和pip3的正确...</a>
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                    <a href="https://my.csdn.net/u014259820" class="user-name" target="_blank">u014259820：</a>[reply]yogiman[/reply]
1、mac下默认的python环境集成了easy_install，如果是window则需要另行安装&lt;/br&gt;
2、brew和Homebrew应该都是可以安装Python，安装后，对应python保存的路径不一样而已。具体可以看我的另外一篇博文：https://blog.csdn.net/u014259820/article/details/81023224#comments&lt;/br&gt;
3、可以通过virtualenv来管理，看个人喜好了                </p>
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                    <a href="https://my.csdn.net/yogiman" class="user-name" target="_blank">yogiman：</a>[code=csharp]
1. 请问可以 `easy_install` 是mac原生的么？ 如果不是的话，是不是还需要将easy_install的安装加入呢？

2. 是不是可以通过brew来安装 `python` 以及 `python@2` 呢？ 毕竟Homebrew是Mac上的默认包管理工具

3. python版本的切换是不是通过virtualenv来管理更加合适/clean呢?
[/code]                </p>
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                    <a href="https://my.csdn.net/u014259820" class="user-name" target="_blank">u014259820：</a>[reply]SenseFly[/reply]
客气~                </p>
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                    <a href="https://my.csdn.net/SenseFly" class="user-name" target="_blank">SenseFly：</a>多谢！                </p>
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                    <a href="https://my.csdn.net/u014259820" class="user-name" target="_blank">u014259820：</a>[reply]Rain_Hpu[/reply]
不用也行，可以写到一个Main类里面                </p>
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